Magnetic separating machine



Patented Mar. 24, 19 1 UNITED STATES PATENT omen onone ULLBICH, ormennnune, eEnmANY, nssrenon ro 'rnE FIRM rampant? GR'QSONWERKAKTIENGESELLSGHAFT,

or MAGDEBUna-BgoKA GERMANY,

menn'rrc sn miaa'rme MACHINE Application filed August 17, 1929, SerialNo.

My invention relates to machines for dressing and classifying ores andmetallurgical waste products such as slags, sweepings and other residuesby separating through magnetic force the more valuable parts from thosenot responsive to magnetism.

The invention relates more especially to'an improved feeding device formagnetic separating machine for the purpose set forth and of the typediagrammatically shownin the drawing in which a hollow cylindrical shellof. diamagnetical material rotate on a horizontal axis around thepole-shoes of a stationary field magnet.

Feeding devices for magnetic separating machines of this type are knownby whi'ch the material under treatment is preliminarily classifiedthrough a vibrating sieve, the larger lumps which will pass over thesieve proceeding directly to the upper part of the rotary magnetic drum,while the finer granules dropping through the vibrating sieve anddescending on a sloping chute under- 'neath the sieve will arrive at alower section of the magnetic drum, where the latter presents anupwardly-revolving surface to the descending material.

In order to insure with magnetic separating machines of this typeeflicient working of the rotary drum the'gapthrough which the materialdescends at the lower section of the drum 'must be comparatively narrowand in practice great difliculties havenbeen' found in keeping clearahdimobstructed the passage forithe de'scendingmaterial. Particularlywhere the material under treatment is in a somewhat moist and stickycondition there is always a tendency of the said passage machine.

becoming choked, an occurrence WlllCll frequently interferes with theproper working of the feeding device and of th e rest of the Theprincipal object of my invention is to overcome the said difiicultiesand to provide an improved feeding'device for the purpose concernedwhich is safe against being choked and which is so simple in its design,that its principal member. can be provided at low cost and can beattached to advantage subsee quently to magnetic separating machines,

386,691, and in Germany Oetoberlfi, 1928.

having a feeding device of the old ferred to hereinbefore. I

Other objects of this invention will incidentally appear here'inaft VThe nature and scope o the'invention are briefly outlined. in theappended claim andwill be more fully understood by the follow- 9 ingspecification taken together with the ac; companying drawing.

In the latter a magnetic separating: machine for the purpose set forthand having an improved feedin device attached to it is diagrammaticallys own by way of an example.

The material to be treated is dumped into a hopper 1 from which itpasses by gravitational force over a vibrating sieve 2; the coarserlumps proceeding directly to the upper part of the magnetic drum 3,rotating in theldirection of arrow :0, while the finer gran-- ules dropinto a chute 4.

According to this lnvention an auxiliary neath the deliver end of saidchute 4, so as to rotate in the direction of arrow y, and is spaced fromthe magnetic drum 3 thus forming a bridge between the chute 4 and themagnetic drum 3.

feed roller 5 is rotatably mounted under- Extended experlments of minehave shown that the former troubles viz. clogging of the material inthegap between the delivery end of the chute 4 and the magnetic drum 3 iseffectively -prevented by the auxiliary feeding roller 5 described.

The valuable particles of the material responsive to magnetic attractionwill be drawn upwardly by the rotary drum 3 while those parts notresponsive to magnetic attraction drop into a rece tacle 6.

The coarser umps, proceeding from the sieve 2 directly to the upper partof the drum 3 are magneticall dressed in the usual way, the coarservalua le lumps dropping into a receptacle 7 jointly with the magneticparticles of the finer material, while the nonmagnetic lumps drop into-an endless con veyor 8 by which they are carried off -in order to befurther classified by ha d.

Various changes and modlfications may 'be made in the construction anddesign of im-' 'ff proved devices of the type and for the purposedescribed above and in the assemblage and Cooperation of their componentparts, without's'ubstantiall' departing from the spirit-and the salienti eas of my inven- 7 tion and without sjacrificin 'tag'esreierred tohereinb'e ore.

any of'the advan- For-exampleadjusting and setting devices ofanyrconvenient type (not shown) may be provided-for adjusting andcontrolling in a manner known per se the effective distance of thefeeding'roller 5- from the chute and v from the .magnetie'drumrespectively, so as to adapt the function of the feedmg device per se invarious branches of manufacture' to varying conditions.

Also means (not shown) for changing the rotary speed of the feed rollermay be provided -forthe samepu'rpose viz. to'enable the operators tocope with Varying conditions and materials of difierent nature. am awarethat feeding rollers are known and I make no claim except for theirappli-' cation at .the specified place for cooperation with feedingdevices of magnetic separating machines of the type set forth. a

What I claim is 5' In a magnetic separatingmachine for dressing andclassifying ores and metallurgie cal waste products the combination witha stationary field magnet of a hollow drum hav mg an automatic eedingdevice comprising in combination a vibratory sieve adapted topreliminarily classify the material under treatment and to convey thecoarser lumps to the upper part of "the rotary magnetic drum,

a chute arranged underneath said sieve'on which the finer materialdescends to a lower\ section oi the magnetic drum and a'rotary feedingroller arranged underneath the delivery end of the said chute andforming a bridge for the material, to be conveyed to the lower sectionof the magnetic drum.

In testimony whereofl have signed my name to this specification.

D Inc. H. e. GEQRG ULLBICH.

